US20140119973A1 - Internal gear pump - Google Patents

Internal gear pump Download PDF

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Publication number
US20140119973A1
US20140119973A1 US14/124,747 US201214124747A US2014119973A1 US 20140119973 A1 US20140119973 A1 US 20140119973A1 US 201214124747 A US201214124747 A US 201214124747A US 2014119973 A1 US2014119973 A1 US 2014119973A1
Authority
US
United States
Prior art keywords
internal gear
gear pump
filler piece
sealing element
annulus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/124,747
Other languages
English (en)
Inventor
Rene Schepp
Norbert Alaze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALAZE, NORBERT, SCHEPP, RENE
Publication of US20140119973A1 publication Critical patent/US20140119973A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/101—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with a crescent-shaped filler element, located between the inner and outer intermeshing members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0019—Radial sealing elements specially adapted for intermeshing-engagement type machines or pumps, e.g. gear machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes

Definitions

  • the invention relates to an internal gear pump, in particular for a hydraulic vehicle brake system having the features of the preamble of claim 1 .
  • Internal gear pumps of this kind are employed in slip-controlled and/or power-operated vehicle brake systems instead of conventional piston pumps and are often referred to as return pumps, although this is not entirely accurate.
  • Internal gear pumps are known. They have a pinion, i.e. an externally toothed gearwheel, which is arranged eccentrically in an internally toothed annulus and meshes with the annulus at one point on the circumference or in one section of the circumference.
  • a pinion i.e. an externally toothed gearwheel, which is arranged eccentrically in an internally toothed annulus and meshes with the annulus at one point on the circumference or in one section of the circumference.
  • Driving the pinion in rotation causes the annulus to be driven in rotation as well, and the internal gear pump delivers fluid in a manner known per se, the fluid delivered in a hydraulic vehicle brake system being brake fluid.
  • the pinion and the annulus can also be referred to as gearwheels of the internal gear pump.
  • the internal gear pump has a crescent-shaped free space between the pinion and the annulus, in which a filler piece is arranged.
  • the filler piece can normally be pivoted about an axis parallel to the axis of the internal gear pump. Owing to the curved shape, the filler piece is also referred to as a crescent, and internal gear pumps with a filler piece of this kind are also referred to as crescent pumps. Tooth tips of teeth of the pinion rest on a concavely rounded inner side of the filler piece, and tooth tips of the annulus rest on an outward-curved outer side of the filler piece.
  • the tooth tips of the teeth of the pinion and of the annulus slide along the inner and outer side of the filler piece, respectively.
  • the filler piece encloses interspaces between the teeth of the pinion and between the teeth of the annulus at the circumference, thus enclosing fluid volumes in the interspaces between the teeth of the pinion and of the annulus, said volumes being pumped from a pump inlet to a pump outlet by the rotary driving of the pinion and the annulus.
  • the pump inlet forms a suction side and the pump outlet forms a pressure side of the internal gear pump.
  • Patent EP 1 760 315 A2 discloses an internal gear pump of this kind, the filler piece of which is divided in the circumferential direction and has an inner part, referred to as a segment carrier, and an outer part, referred to as a segment.
  • Leaf springs arranged between the inner part and the outer part press the inner part and the outer part radially apart and against the tooth tips of the teeth of the pinion and of the annulus in order to ensure good contact with the tooth tips and hence a good sealing effect, which is a prerequisite for a high efficiency of the internal gear pump.
  • this pressure acts on a gap or interspace between the inner part and the outer part of the filler piece.
  • the pressure buildup during operation of the internal gear pump presses the inner part and the outer part of the filler piece of the known internal gear pump apart and against the tooth tips of the teeth of the pinion and the annulus, supplementing the effect of the leaf springs, and thereby improves the sealing effect.
  • the known internal gear pump has axial plates, which are arranged on both sides of the gearwheels and of the filler piece in a manner which prevents relative rotation and allows axial movement.
  • the axial plates are subjected to a fluid delivery pressure by a pressure side, i.e. an outlet, of the internal gear pump and, as a result, are pressed inward against the gearwheels and the filler piece of the internal gear pump in order to form a seal there.
  • the known internal gear pump has a large number of expensive components and it is complex to assemble. Given smaller dimensions for an internal gear pump of a hydraulic vehicle brake system, precision of the components, which is necessary for good volumetric efficiency, is scarcely achievable at an economically justifiable cost.
  • the filler piece of the internal gear pump according to the invention having the features of claim 1 , has an inner part and an outer part. Tooth tips of teeth of the pinion of the internal gear pump rest on an inner side of the inner part, and tooth tips of teeth of the annulus of the internal gear pump rest on an outer side of the outer part.
  • An axial sealing element is arranged between the inner part and the outer part, said sealing element being composed, in particular, of an elastomer and sealing off sides of the filler piece, i.e. forming a seal between the filler piece and axial plates of the internal gear pump, if it has the axial plates.
  • the sealing element forms a seal with respect to inner end faces of a pump casing or of a pump space, against which the gearwheels and the filler piece of the internal gear pump rest.
  • the invention improves sealing between a suction side and a pressure side, i.e. between an inlet and outlet of the internal gear pump, and thereby increases the efficiency thereof.
  • the invention allows larger production tolerances for the components of the internal gear pump and, inter alia, renders axial plates for axial compensation superfluous.
  • FIGURE shows a side view of an internal gear pump according to the invention.
  • the internal gear pump 1 which is illustrated in the drawing, is provided as a hydraulic or “return” pump in a hydraulic vehicle brake system having traction control. It has a pinion 2 , i.e. an externally toothed gearwheel, which is arranged in a manner fixed against relative rotation on a pump shaft 3 .
  • the pinion 2 is arranged eccentrically in an internally toothed annulus 4 , which is mounted rotatably in a pump casing 5 . Housing covers are not shown to ensure that the inner parts of the internal gear pump 1 can be seen.
  • the pinion 2 meshes with the annulus 4 in one section of the circumference.
  • the pinion 2 and the annulus 4 are also referred to as gearwheels 2 , 4 of the internal gear pump 1 .
  • the internal gear pump 1 has a crescent-shaped free space 6 between the pinion 2 and the annulus 4 , which can also be referred to as the pump space. Bores parallel to the pump shaft 3 open into the free space 6 in the region of both ends of the free space 6 .
  • One of the two bores forms a pump inlet 7 , and the other forms a pump outlet 8 .
  • the pump inlet 7 can also be taken to be the suction side and the pump outlet 8 can be taken to be the pressure side of the internal gear pump 1 .
  • a filler piece 9 is arranged in the free space 6 , between the pump inlet 7 and the pump outlet 8 , often also being referred to as a crescent or crescent piece owing to its shape.
  • the filler piece 9 separates a suction and inlet side of the free space 6 from a pressure and outlet side.
  • the filler piece 9 has an outer part 10 and an inner part 11 .
  • the outer part 10 and the inner part 11 are in the form of circular arcs corresponding to tip circles of the gearwheels 2 , 4 .
  • An outer side of the outer part 10 rests on tooth tips of teeth of the annulus 4
  • an inner side of the inner part 11 rests on tooth tips of teeth of the pinion 2 .
  • the outer part 10 is angled radially inward at a suction-side end and forms a yoke 12 of the filler piece 9 . It would also be possible, instead, for the inner part 11 to be angled radially outward at the suction-side end thereof.
  • the filler piece 9 On the suction side, the filler piece 9 is supported by means of the yoke 12 thereof on a stop pin 13 , which passes through the free space 6 on the suction side of the filler piece 9 , parallel to the pump shaft 3 .
  • the outer part 10 and the inner part 11 are bent sheet metal parts and are produced by bending from sheet metal strips.
  • An axial sealing element 14 which is composed of an elastomer, is arranged between the outer part 10 and the inner part 11 .
  • the axial sealing element 14 is U-shaped in side view and has a relatively solid yoke region 15 and two legs 16 , 17 .
  • the word “solid” is intended to indicate that the yoke region 15 extends a relatively long way from the yoke 12 of the filler piece 9 in the direction of the pressure side of the internal gear pump 1 ; in the illustrated embodiment of the invention, the extent of the yoke region 15 in the circumferential direction is approximately as great as a radial spacing of the tip circles of the gearwheels 2 , 4 at the location of the yoke region 15 of the axial sealing element 14 .
  • the legs 16 , 17 of the axial sealing element 14 extend integrally from the yoke region 15 along an inner side of the outer part 10 and the outer side of the inner part 11 of the filler piece 9 , wherein the legs 16 , 17 of the sealing element 14 are shorter in the circumferential direction than the outer part 10 and the inner part 11 of the filler piece 9 .
  • a cavity 18 which, like the filler piece 9 , is open toward the pump outlet 8 , i.e. toward the pressure side of the internal gear pump 1 , and is subjected to a pressure of the brake fluid on the pressure side and in the pump outlet 8 of the internal gear pump 1 .
  • the axial sealing element 14 is connected to the outer part 10 and to the inner part 11 of the filler piece 9 , being adhesively bonded for example.
  • the sealing element 14 is vulcanized onto the outer part 16 and the inner part 17 .
  • the outer part 10 and the inner part 11 of the filler piece 9 can be inserted as shaping elements into an injection mold, for example, with the result that production of the sealing element 14 and connection to the outer part 10 and the inner part 11 take place in a single production step.
  • the axial sealing element 14 can also be produced separately and then connected to the outer part 10 and the inner part 11 of the filler piece 9 .
  • the sealing element 14 connects the outer part 10 and the inner part 11 to one another.
  • the solid yoke region 15 of the sealing element 14 presses the outer part 10 and the inner part 11 apart, i.e. presses the outer part 10 outward against the tooth tips of the teeth of the annulus 4 and the inner part 11 inward against the tooth tips of the teeth of the pinion 2 . This ensures sealing between the filler piece 9 and the teeth of the gearwheels 2 , 4 when the internal gear pump 1 is unpressurized.
  • the pressure on the pressure side of the internal gear pump 1 pressurizes the cavity 18 between the legs 16 , 17 of the sealing element 14 and presses the outer part 10 outward against the tooth tips of the teeth of the annulus 4 and the inner part 11 inward against the tooth tips of the teeth of the pinion 2 , thereby ensuring sealing, even when the delivery pressure is high.
  • the axial sealing element 14 exerts a lateral sealing action. Subjecting the cavity 18 between the legs 16 , 17 of the sealing element 14 to the pressure of the pressure side of the internal gear pump 1 exerts a radial pressure on the legs 16 , 17 , thereby pressing the legs 16 , 17 laterally outward, improving the lateral sealing action of the axial sealing element 14 as the delivery pressure of the internal gear pump 1 rises.
  • the axial sealing element 14 ensures a good sealing effect, both when the internal gear pump 1 is unpressurized and during operation.
  • the internal gear pump 1 has axial plates 19 on both sides, said plates being capable of axial movement and being penetrated by the pump shaft 3 and the stop pin 13 , thereby being held fixed against relative rotation.
  • the axial plate 19 at the front in the direction of view is not shown because it would obstruct the view.
  • the axial plates 19 have the approximate shape of circular segments which are taller than their radius.
  • a radius of the axial plates 19 is smaller than an outer radius of the annulus 4 and larger than a root circle radius of the annulus 4 , with the result that the axial plates 19 cover interspaces between the teeth of the gearwheels 2 , 4 .
  • the axial plates 19 In the circumferential direction, the axial plates 19 completely cover the filler piece 9 and the free space 6 between the gearwheels 2 , 4 on the pressure side of the internal gear pump 1 , and partially cover it on the suction side, ensuring that the pump inlet 7 remains free.
  • the axial disks 19 are subjected to the pressure of the pump outlet 8 , i.e. to the pressure of the pressure side of the internal gear pump 1 , and are thereby pressed into or held in sealing contact with the side faces of the gearwheels 2 , 4 and the sides of the axial sealing element 14 in the filler piece 9 .
  • the axial sealing element renders the axial plates 19 provided for axial compensation superfluous, even if the axial plates 19 are present in the illustrated and described embodiment of the invention.
  • the axial sealing element 14 enables lateral sealing of the filler piece 9 without axial compensation on rigid inner end faces of the pump casing 5 facing the gearwheels 2 , 4 and the filler piece 9 and/or axial compensation on the housing cover (not shown).
  • One of the two axial plates 19 has a punched tab which is bent inward, i.e. between the two gearwheels 2 , 4 , and forms an abutment 20 for the filler piece 9 .
  • the abutment 20 is situated on a pressure-side end of the outer part 10 and of the inner part 11 of the filler piece 9 and secures the filler piece 9 against movement in the direction of the pressure side.
  • a punched opening 21 out of which the abutment 21 is bent inward, the pressure region of the free space 6 communicates with the pump outlet 8 .
  • the tab forming the abutment 20 is formed by bending inward, i.e. by forming, on one axial plate 19 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US14/124,747 2011-06-24 2012-04-25 Internal gear pump Abandoned US20140119973A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011078064.5 2011-06-24
DE102011078064A DE102011078064A1 (de) 2011-06-24 2011-06-24 Innenzahnradpumpe
PCT/EP2012/057538 WO2012175236A2 (fr) 2011-06-24 2012-04-25 Pompe à engrenages à denture intérieure

Publications (1)

Publication Number Publication Date
US20140119973A1 true US20140119973A1 (en) 2014-05-01

Family

ID=45999843

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/124,747 Abandoned US20140119973A1 (en) 2011-06-24 2012-04-25 Internal gear pump

Country Status (5)

Country Link
US (1) US20140119973A1 (fr)
EP (1) EP2724028A2 (fr)
KR (1) KR20140031331A (fr)
DE (1) DE102011078064A1 (fr)
WO (1) WO2012175236A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021126766A1 (fr) * 2019-12-17 2021-06-24 Cummins Inc. Croissant flexible pour pompe à carburant basse pression
GB2588752B (en) * 2019-10-21 2022-06-15 Delphi Tech Ip Ltd Fuel pump assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200485265Y1 (ko) * 2016-07-05 2017-12-13 훌루테크 주식회사 내접기어펌프

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486459A (en) * 1967-02-28 1969-12-30 Daimler Benz Ag Internally toothed gear pump,especially for the pressure medium supply of automatic change-speed transmissions
US4472123A (en) * 1979-10-19 1984-09-18 Messrs. Otto Eckerle Gmbh & Co. Kg Internal gear machine with segmented filler members
US6183229B1 (en) * 1997-12-03 2001-02-06 Luk Getriebe-System Gmbh Hydraulic apparatus
US6450792B1 (en) * 1998-12-18 2002-09-17 Hydraulik-Ring Gmbh Hydraulic displacement machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005041579B4 (de) 2005-09-01 2015-06-11 Bosch Rexroth Aktiengesellschaft Innenzahnradpumpe mit Füllstück
DE102007049704B4 (de) * 2007-10-17 2019-01-31 Robert Bosch Gmbh Innenzahnradpumpe für eine Bremsanlage
DE102009047643A1 (de) * 2009-12-08 2011-06-09 Robert Bosch Gmbh Innenzahnradpumpen für eine hydraulische Fahrzeugbremsanlage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486459A (en) * 1967-02-28 1969-12-30 Daimler Benz Ag Internally toothed gear pump,especially for the pressure medium supply of automatic change-speed transmissions
US4472123A (en) * 1979-10-19 1984-09-18 Messrs. Otto Eckerle Gmbh & Co. Kg Internal gear machine with segmented filler members
US6183229B1 (en) * 1997-12-03 2001-02-06 Luk Getriebe-System Gmbh Hydraulic apparatus
US6450792B1 (en) * 1998-12-18 2002-09-17 Hydraulik-Ring Gmbh Hydraulic displacement machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2588752B (en) * 2019-10-21 2022-06-15 Delphi Tech Ip Ltd Fuel pump assembly
WO2021126766A1 (fr) * 2019-12-17 2021-06-24 Cummins Inc. Croissant flexible pour pompe à carburant basse pression
US12117003B2 (en) 2019-12-17 2024-10-15 Cummins Inc. Flexible crescent for low pressure fuel pump

Also Published As

Publication number Publication date
DE102011078064A1 (de) 2012-12-27
WO2012175236A3 (fr) 2013-07-18
WO2012175236A2 (fr) 2012-12-27
EP2724028A2 (fr) 2014-04-30
CN103635690A (zh) 2014-03-12
KR20140031331A (ko) 2014-03-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHEPP, RENE;ALAZE, NORBERT;REEL/FRAME:031738/0474

Effective date: 20131114

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION